8404129 has 4 divisors (see below), whose sum is σ = 8410180. Its totient is φ = 8398080.

The previous prime is 8404127. The next prime is 8404141. The reversal of 8404129 is 9214048.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5688225 + 2715904 = 2385^2 + 1648^2 .

It is a cyclic number.

It is not a de Polignac number, because 8404129 - 2¹ = 8404127 is a prime.

It is a Duffinian number.

8404129 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8404097 and 8404106.

It is not an unprimeable number, because it can be changed into a prime (8404127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217 + ... + 4105.

It is an arithmetic number, because the mean of its divisors is an integer number (2102545).

Almost surely, 2^8404129 is an apocalyptic number.

It is an amenable number.

8404129 is a deficient number, since it is larger than the sum of its proper divisors (6051).

8404129 is a wasteful number, since it uses less digits than its factorization.

8404129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6050.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 8404129 is about 2898.9875818982. The cubic root of 8404129 is about 203.3125730544.

The spelling of 8404129 in words is "eight million, four hundred four thousand, one hundred twenty-nine".